Ophthalmic mounting



Feb. 14, 1928.

H. A. SANGREN OPHTHALMIC MOUNTING Filed Jan. 30. 1926 gva/vento@ 215mg] (Zarlqren.

Patented Feb. 14, 1928.

UldIlfED PATE-NT OFFICE.

u"TTON VOE MASSACHUSETTS.

`Hazan-Y A. SANGREN, or soUTrIBRrnan, MASSACHUSETTS, Assronon To AMERICAN OPTICAL COMPANY, or soUTHBninen,

M'ASSCHUSETTS, A VOLUNTARY .ASSOCTA- ornTnALM-ro MOUNTING.

Application filed January This invention relates to ophthalmic mountings and has particular reference to an ophthalniic mounting made from a composition .material in which the lenses are seated in a lens rim which yis itseliiin turn seated in the 'ranie ol: the mounting.

rThe principal object of this invention is to sprovide -a lens holding rim that maybe easily snapped into or out of a rim'member of a `composition `ophthalmic trame.4

Another object of :the inventionjis to provide simple,"eliicient and inexpensive means for :holding a lens in a composition opthalmic iframe.

Another object of the invention is to provide` a `resilient lens holding member that maybe snapped into or out oit position in a composition ophthalmic traine, being'held therein in `use through the natural elasticity of the material 'from which the composition ophthalmic frame is made.

@ther objects and advantages of the invention should become apparent from the following description taken inconnection with the accompanying drawings,` wherein only kone form ot the invention has been shown by way ot' illustration. It will be understood that I may make many changes in the arrangement of parts described as set forth in the claims without departing from the spirit of the invention. I, therefore, do not wish to be limited exactly to the details of construction and arrangement of partsl shown and described.

Referring to the drawings, in which similar characters ot reference are used to designate similar parts throughout:

Figure lis a front view of an ophthalmic frame embodying` the invention;

Figure 2 is a partial cross section on line 2-2 of Figure l; 1

Figure 3 is a partial cross section similar to Figure 2, showing a modification;

Figure 4 is a fragmentary portion ot Figure 2 enlarged.

Prior to my invention it has been customary to insert the lenses in the iframes of composition material, such as Celluloid, by heating the composition frame to stretch it, and putting the lens in place where it will be tightly gripped when the composition frame becomes cool through contraction. It has also been necessary to go through the same heating operation in removing the lenses.

3G, 1926. Selial No.V 84,867.

"This heat-ingoil the ,frames ;is liable to warp trames of this character while the `said trames are cold, thus obviating the necessity of heating the frames and running the chance oi' distorting them so that 4they cannot rbe used.

f In `one form ot my invention as shown in llligure, I have provided a metallic lens :rim l Vhaving a V-shaped `lens groove Qinwhich the .lens 3 `is inserted. i The composition -or celluloid :trame il is grooved to lit the-under side'of the metallic riml, the point 5 oi the groove being flower than the points 6 and 7. rIhe metal rim l is split ordivided atf8, Figures l and 4l, so that the lens 3 maybe insei-ted. in the `rim l, the rim l issnapped onto `the composition rim l throughthe natural elasticity of the material of which the rim 4 is made. The lower :face of the rim l acts as a wedge camto force open the rim 4. After the point 5 of the rim l has passed the point G it slips naturally into the groove and the rim snaps back int-oplace, thus locking-` the metallic rim with the lens therein. To remove the lens the operation is the same but in the reverse direction. The lower tace of the rim l being wedge shaped it acts as a` cam in bot-h directions so to remove it it is only necessary to press on the lens in the opposite direction, torce the rim open through its natural elasticity and take out the lens. i

In Figure 3, I have shown a modilication in which no metallic rim l is used, but in place thereor". I use ak composition or celluloid rim 9 which I do not have to divide or split, as in the case of the metallic rim l. In this type the composition rim l is provided with an inclined grooved tace l0 and a locking shoulder ll; the point l2 being lower than the point 11 the angle ot' the face l0 lits the bevel oit the lenses 3 on one side and the angle oi' the :tace 13 ot the rim 9 lits the bevel ot the lens 3 on the other side, the rim 9 being locked in the rim et Alfter the lens 3 has been inserted l2 passes over the Shoulder 11 thus locking the rim 9 in the rini d. In this operation the natural elasticity of the riin 9 and the riin 4t aids in its operation. The riin 9 has the Wedge cani l'aces as doet` the riin l, and the lens may be removed exactly the saine as the lens is removed in Figure 2, by press ing on the lens in the reverse direction, which brings the riin S) ont ot place.

It will be seen that both the rims l and 9 will provide means, by which the lens may be snapped into the composition frame 4t to hold it in place, and it may be snapped out of position when it is desired to remove the lens.

From the foregoing description it will be Seen that I rave provided simple, etiicient and inexpensive i'ueans Well suited for the objects and uses set forth above.

Having described my invention, I claini:

l. In a device ot the character described, an elastic riin having an annular groove on its inside with inclined Walls, the center of the groove being lower than the edges of the groove and one side of the groove being shaped to engage one side ot' a lens, and an annular' riin whose outer periphery is shaped to lit in the groove ot the elastic rin'i and Whose inner portion is Shaped to engage the. other side of the lens, whereby the annular riin may be sprung into the elastic rim by pressure, the outer periphery acting as a cam face to spring the elastic rim, and whereby the annular rini may be pushed out ot' the elastic rim in the same inauner in the oppoeite direction.

2. In a device olf the character described, a riin having an annular groove on its inside with inclined L4alle, the center ot' the groove being lower than the edges ot the groove, and one edge oi the groove lower than the other and an elastic annular riui having a lens engaging tace on its inside and its outer periphery shaped to lit the groove in the tirst rini, vfhereb)Y the annular elaet-ic rin'i may be sprung into the tiret riiu by preessure, the outer periphery acting as a cam tace to spring the elastic annular rini into the lrst riin, and whereby the elastic annu lar rini may be pushed out ot the first rim in the saine manner in the opposite direction.

ln a device ot the character deseriliied, an elastic riin having' an annular groove ou it1-. inside with inclined walls, the center o't the groove being lower than the edges oi? the groove and one edge ol the groove lower than `the other and an elastic annular rim having a lens engaging tace on its inside and its outer periphery shaped to tit the groove in the iirstriin, Wherelgiy the elastic annular riin may be sprung into the first rim by pressure, the outer peripl'ieiy acting as a cani iace to spring the elastic rinus, and whereby the elastic annular rini may be pushed out ot the first rin; in the saine uianner in the opposite direction.

HARRY A. SANGREN 

